> Hi Tony
> Did you say Data Dynamics? I certainly knew them. I used
> to sell them LA36 print mechs.
Yes, almost certainly the same company. They sold several teleprinters
based on the Teletype Model 33. Same mechanics, but IMHO a nicer (all
metal) case and different electronics.
> punches and two keyboardless golfball typewriters. I have forgotten
> exactly what types they were. I think the punch said something like
> BPRE on it and the readers did not match the rest of the system being
Probably BRPE (normally pronounced 'Burpee') which is a high speed
(something like
> NOTE: I will pay a generous price for a few inches of papertape repair tape
> if anyone has any! I am located in Landenberg, PA USAContact me
> privately if you can help.
The official splicing tape I've seen is in little squares with all holes
punched
(probably covers 9 or 10 characters
>
> So I owend up said I wired it. The answer came back oh if its a
> personal job it gets top prioriy.
> You can use what ever equipment you want and take whatever components
> you need.
> I often borrowed a scope ove the week end.
I know a chap who runs a small electronics company. He
[H745 regulator]
> Tough-sh to physically work on/test. These are not made for field service
> IMHO, just swap out part.
If you make up the extension lead so you can run it outside the PSU chassis
then
it is very easy to work on. The PCB is exposed on one side of the brick and as
I said it's
> There is a pdp 11 troubleshooting guide on Bitsavers that covers the h742
> powersupply and regulators 744. 745, 754. Assuming that is what you have.
>
> They're all tough to work on especially the regulators but I agree with
> Tony that you need to lock down the main suppl first.
I am not
>
> Hi folks,
>
> I've begun repairing my PDP 11/40 and have tracked down the first major issue
> to the H745 (-15v) regulator.
Before you dive into the brick (sounds painful!) check that the +15V DC input
is present and correct. Unlike
the +5V units (H744, etc) the H745 needs both the 20V AC
> My reading of the Qbus spec is that P OK and DC OK are active high. That
> diagram
They are, for a very logical reason. Remember you can wire-AND open-collector
signals
-- that is link them together so that any driver can pull the line low and the
line will
only be high if all driver
> > COMBINE THEM THEN JUST ADD TWO LETTERS AND A DASH AS THUS
> > CC-
>
> SOMEONE SUGGESTING THIS AND USING CAPITALS ONLY PROVES TO BE A MAIL NOOB
> ;-)
Or is using a Model 33 ASR (or KSR) :-)
-tony
> For that many rollers and that amount of money, personally I would spend it
> on a small
> lathe such as a Unimat, Taig or Sherline (I'm a Unimat fanatic myself, I love
> 'em. A
> vastly underrated machine if there ever was one).
Actually I have a Myford Super 7...
> For sources of hard
>
> They were for video in and out. You could sync the VT100 to a feed of
> mono video and the overlaid
> picture would appear on the screen and at the video out connector.
Actually, I beleive (confirmed by the VT100 tech manual and schematics)
that you have to sync the external video to the
>
> I remember joining DEC in early October 1973. At the time I was working
> for a small local company called Newbury Labs.
When I was an undergraduate at Cambridge University (1985-1988) they were
still using (somewhat later) Newbury terminals on the mainframe. Due to the
metal cases they
>
> Yes much as I thought. What about S100 systems?
> Many did have lamps and switches but I can think of a couple that didn't .
> Northstar Horizon for one and Cromenco also.
If you have a machine that allows for other devices to become a bus master and
access memory and I/O devices (S100 does
>
> If it has a transistor at the primary side, and a high frequency transformer,
> it's a switching supply.
> Those want a load, usually. Especially the older ones.
If there are large-ish electrolytics (100's of uF) with a voltage rating around
200V and no reason to
believe that there is a
> That said, it's possible that there may be an auxiliary linear regulator in
> there. That's common
> for additional outputs with modest current needs, especially in older
> designs where the
> switching circuitry takes a lot of individual components. A TO-3 can isn't
> what I would
> One problem with a front panel on an S100 machine - or any
> microprocessor-based
> machine - is getting access to the program counter so you can tell it to
> start running
> at some arbitrary address. The Altair/IMSAI panels resolved this with a hack,
> jamming
> a jump instruction into
>
> You mentioned DEC PSUs, this one is actually made by ASTEC. I will use a
Firstly, every Astec PSU I've seen has been a swticher. They probably did make
linear PSUs, but not common...
Secodnly, it may have been made to a DEC design (rather than just a
specification).
I believe you
[Chopper transistor]
> This one is a D905.
I assume that's a 2SD905 (the '2S' is often left off the package). From the data
I've seen that certainly could be used as a chopper transistor.
-tony
>
> Then you've not come across the ones in TK50Z desktop cases (and a few
> other things). They don't like operating without a minimum load,
No, probably not. Actually I may have one somewhere, but have never had to
repair it, so have never run it without a load.
Thanks for the warning
>
> Hi Guys
> Sitting here doing the overlays for the 8/e silk screen run.
> I had a thought. Including all makes of computer old and new.
> What about a front panel with lights and switches for systems
> that never had one and could have done with one?
> Which computer would you
>
> Hi Tony
> I seem to remember, certainly in OEM land there were dev.
> systems with front panels and production systems without.
> In other words the front panel was option and could be fitted.
Sure. The PDP8/f and PDP8/m are the well-known example. Many of the
Philips P800s had
[RL cables]
> AFAIK that cable is purely a bus (i.e. no radial per-drive wires), so you
> should just be able to run it to the second connector, no issue. However,
> I'm too lazy to check to make sure that's absolutely 100% accurate. :-)
It is just a bus. The internal drive cable is just a
>
> When you had machines with an RL-drive "internal", you normally did not
> use a cab kit. That was for external drives. The same is true for all
> other DEC drives I know as well. I've certainly seen direct cabling
> internally for SDI drives as well as external cabling for RX50 and TK50.
The
> > And my advice, sadly learnt and forgotten quite a few times, always after
> > drilling a critical part:
> >
> > CLAMP THE JOB DOWN!
> +1 on Steven's advice, having learned this lesson the hard-way.
I'll second (third? nth?) that!
I was once told that the majority
> experience. An 'UP ARROW' means nothing, nor does 'FRAGILE'
I thought 'Fragile' meant 'Use this package for playing American Football'
This it not a new problem, it probably pre-dates the ASR33. Flanders and Swann
(think of them as being the British equivalent of Tom Lehrer) said
The new
[HD 3.5" disks and the density-select hole]
> Of course, on a DD-only drive, the drive is blind to the extra hole.
Not always! The original Sony full-height drives (the 600rm ones) have a
disk-inserted sensor positioned exactly where that hole is. So if you insert
an HD disk the drive doesn't
>
> On the HP 2100 series machines (and possibly 1000s?) - those top of
> the card connectors - are they the 2 x 24 contact on 0.156" centers
> types?
In most cases yes. There are some which are obviously 0.1" pitch.
-tony
>
> Yes, the Sony OA-D32 drives. Single-sided 600 RPM. One *could* argue,
> that, given the data rate, it's already "high density" (of a sort). I
I would say it's normal double density (the spacing of the flux transitions
on the disk is the same as on a PC 720K disk) but a high data rate due
> My favorite low tech dummy load is the one my father came up with: a couple
> of
> resistors (carbon composite is best, carbon film or metal film will do), 1-2
> watt size,
> in a jar filled with water. Works just fine for 100 watts or so, and is
> useable not just
> for power supplies
>
> For reasons too abstruse to explain in detail I'm on the lookout for
> terminals that are, physically, really small - especially serial and
> coax 3270, and possibly twinax 5250.
>
> Yes you could do things with small laptops and PDAs with PCMCIA cards
> and adapters and software - I know a
> I'm wondering what I can put between the two to keep the cable from
> disconnecting from the adapter. Some searches seem to indicate I want
> some 4x40 (or 4-40) female-female (coupling) nuts; does this seem
> correct?
The normal thread for the jackscrews on a D connector is indeed 4-40 UNC.
> Further digging into available eproms that the programmer can read reveals
> it CAN read 2532s, specifically the MCM2532 which the datasheet tells me has
> the same pinout as the 2332. I still get "reverse insertion error" so I'm
> guessing my PROMs are toast.
As others have said, normally when
[HP Palmtops, 95LX etc]
> Oh those look pretty good; I love the terminal emulator in ROM;
> doesn't even need an OS, switch it on and it works; that's one of the
> things I'm after. Shame about the rather nasty looking monochrome LCD
Actually, there is an OS -- MS-DOS -- and it's in ROM too.
>
> That's pretty much what I figured. I took a closer look at one of the
> other dead XT2190s I have that I'd opened up to inspect awhile back and
> there are a few ICs surface-mounted to the flat ribbon cable running to
> the head assembly. I suppose it's likely that one of these has failed,
>
> The UK is full of small companies making and repairing all kinds of past
> products.
>
> For example the MGB GT (a much loved British sports car). The factory
> stopped making them in the early 1980's
> However a few guys bought the press tools and have been turning out two
> or three body
>
> > The 2190 does not, and it fails in precisely the same way I've personally
> > seen three or four
> > other Maxtor drives of the same era fail: It spins up fine, but when it
> > goes to load the heads,
> > it sounds like the voice coil positioner for the heads is "screaming" -- it
> >
>
> > The VT101,02,31, and 32 are the same, as are the VT100, 105, and 125.
>
> If you say they are the same, can you turn a VT101 into a VT102?
I don't think there was an official way to do it (from what I remember the
VT101 was
sold as a 'closed' terminal (maybe replace the logic board),
[VT100, etc, monitor PCB]
> Is that true of the vt102 as well?
I don't think I've ever worked on a VT102, but the same video monitor boards
turn up
in the VT100, VT105 and VT101 (at least). There are at least 3 different types,
at least
2 made by Ball Brothers. From what I remember the 2 Ball
>
> So, does anyone know what the first such "farm" slang term was, and when
> and where it originated? And how about other terms with "farm" in them?
> (I came across a new one the other day, but of course I've forgotten it
> now.)
Not likely to be used much now (well, not outside members of
> > I had another go today, but I fail to see how you managed to pry this
> > thing apart without causing much more damage than appears in your photo.
> > What kind of tool did you use?
>
> My usual technique to deal with these sort of brick and wall-wart PSUs
> that are glued together is to
> "Motherboard" was around then, although Burroughs might not have used it.
> Burroughs might very well have been more inclined to call it "backplane".
I generally use the term 'motherboard' for the sort of thing you find in an
IBM5150 or Apple ][ -- that is a board with a lot of electronics on
> Half density? I vaguely remember an RK05 style drive at half the density.
> RK02? Or am I mixing it up with RP02 vs. > RP03?
No, you're right. The RK02 is the low-density drive (actually a Diablo model
30), the RK03 being the high
density model. The RK05 has the same bit density (heck
[Versatec paper feed motors]
> Yes, absolutely, on the Versatec 1200A. I put those motors
> in a milling machine. Big, round case stepper motors, with
> a ghastly resistor-transistor drive.
You've got me worried now...
I have V80. Actually, it's ICL-badged, and has a GPIB adapter board at
> But, if you mean 74-series logic in general, I think so. Sometime
> within a year or so of '78, I was working with the stuff, and it was as
> an undergrad, so I doubt I would have been working with just-released
> logic.
74xxx logic dates from the late 1960s. There are plenty of production
[ASR33]
> This is a very delicate mechanical device. In spite of the fabulous shipping
> crate, the bolts
> installed to secure the printer, the shipping guys let us down. The thing
> had very rough
> handling, sheared off the shipping bolts, the printer was totally shook up
> and Wayne
> Also for reading in paper tape, a high speed punch and paper tape reader
> is often wanted.
Yes, IMHO the ASR33 reader is an interesting thing to have, but it's only
10cps, and it is not kind to the tapes. A good capstan-fed optical
paper tape reader will do between 300 and 1000cps [1] and will
> Yes, I had a bunch of Versatec 1200A's with the Tektronix
> hard copy feature. the Versatec was the greatest graphics
> printer until laser printers came out, then they became
> instant boat anchors. Here's the process.
Only in the sense that a PDP11, or a VAX, or a PERQ, or
a is a
> The only other terminal I worked
> with that could do that was a Tektronix storage scope terminal (4010
> or 4014, IIRC). The Tek printer wasn't built-in, but it did take a
> scan of the live screen, so that was similar. The paper was
> silver-grey and I remember it coming out wet too.
> That sounds correct. Versatec made printers that used that process, I used
> one
> (attached to the CDC 6500 at U of Illinois PLATO). Very nice for continuous
> roll
> full bitmap graphics.
The Versatec electrostatic plotters are not the same as the VT52 printer, they
are
yet another
>
>
> I had a little Comprint printer in the 1970s/1980s that used something
> sort of like this. The paper was aluminum coated, thus conductive. The
> head was a high voltage electrode unit that burned away the aluminum
> layer. (I can't imagine any kind of deposition technology in that
>
[Aluminium coated paper printers]
> Even Radio Shack had one of those! But not for long. Crumpling the paper
How did the original TRS-80 screen printer work -- the one that plugged into
the
expanison bus and read out video RAM?
The 'Quick Print II' (or some very similar name) was a Radio
> We swapped the TU56 and TU55 drives between the PDP-12 and the PDP-8/I. We
Does the TU55 work correctly on the 8/I ?
> The TU55 behaved a little better than the TU56, and sometimes would
> actually boot OS/8. We continued chasing the issue and found glitches on
> data channel 3. We have
>
> Paul, if you come across any VT52s that have the built-in screen
> printer could you take some pictures please.
>
> Has anyone ever seen one? I had an idea it used a silvered-paper and
> burned it off? or am I mis-remembering.
I have one. Well, in a VT55, but that is a VT52 with a
>
> The bias voltage is generated by the chopper on page three in conjunction
> with T1 and some rectifying diodes on the motherboard. Then it is feed back
> to the bias board on J2:2 to produce the 5V. (page 2)
Yes...
It's not totally obvious at first glance, but this is yet another SMPSU with
>
> I'm slowly coming to terms with the schematic but I'm not quite clear where
> these two voltages are being generated. I note from the block diagram that
> the +15 and +12 are rectified on the motherboard (backplane) -- which
> should make it GREAT fun to probe. So it looks like some careful
>
> Am I missing something? - is there anywhere in that doc that explicitly
> declares the
> association between the 2-dozen connectors, for example, that Line Supply P1
> & P2
> connect to Motherboard J5 & J4, and that Bias and Interface Board J1 & J2
> connect
> to Motherboard J7 & J6?
Not
>
> From a quick glance at the schematic I think that this part is related to
> the fan driving circuitry. The diodes look like some kind of protection
Yes.
> diodes which is good to have when switching inductive loads. I have really
> no idea why they have been removed. But I don't think it
>
> Once again, I find myself in over my head debugging a power supply, this
> time an H7140 from a PDP-11/44. Here's the skinny:
That doesn't surprise me, the H7140 is one of the most complex PSUs you are
likely to come across...
> When power is applied (plugged in, breaker switch flipped to
>
> > Yes, it is a pity that the later board set (a) has the jumper to
> > disable the built-in console port and (b) has the switchable divider
> > allowing higher baud rates so you generally don't need to :-)
>
> Well, except for those of us who don't have any 20mA gear, and want to
>
> > Converting between genuine 20mA loop and RS232 is not that hard.
>
> Yes, but I'm i) lazy, and ii) overwhelmed with other projects! :-)
True, but sometimes (and I have been guilty of this) it takes longer to post
and moan
about the problem than to dig into the junk box, grab the
> > The specific issue of an open grant chain locking the Unibus is a quirk
> > of the M9302 terminator (which asserts SACK under such conditions). This
> > is unlikely to be a problem on an 11/10.
>
> Why? The 11/10 also have a Unibus, and also needs the terminator as well
> as the SACK and
>
> The screen's not connected, nor keyboard. I figured there was no point
> until I got a chirrup.
Well, if the piezo buzzer has failed But I guess that's not very likely.
-tony
>
> When you don't have any core memory, I wonder if you might need bus
> grants in those slots as well...? It's not as if they aren't a part of
> the Unibus... Memory sits on the Unibus, just like everything else,
> remember? Needs to check further if any special wiring are in place for
> those
>
> One chip that does get hot is the Character Generator at UA3 which I was
> going to swap with the one in my other 4032, but that doesn't power up
> either. Presumably I can borrow one from a 3032 or 8096?
A machine with a dead character generator ROM (unless it is so dead as to
pull a power
> might be able to get hold of the bios, but I'm worried about the 3rd
Remember the BIOS might have been specifically modified for that
machine. Things like internal/external video selection are not going
to be in a generic desktop mchine BIOS
> EPROM. It sits in the middle of a bunch of
>
> Well, I agree, sometimes the machine is disassmbled in a way that harms the
> components, or vital components are thrown away/re-cycled because 'they don't
> seem like they are useful/valuable' (case in point, cables - people save the
> boards, and throw away the cables - as a result of
>
> Oops, I forgot to mention a few other checks that I did ...
> AC LO and DC LO are some 4.6V. Both have a 130 mV ripple, no spikes.
> That seems OK to me.
Sure, those sound OK to me too. But you would have felt a right idiot if you
had spent days working through the microcode and CPU logic
> Some corrections to my post regarding the console LED behavior.
>
> Voltage levels on the CPU backplane are still good whne the 2 CPU boards
> are installed in the backplane, but the processor is not responsive to
> the switches on the console panel.
It's been a long time since I've been
>
> Yes, it is an 11/10S.
How do you define '11/10S' ?
> AFAIK, the M7260 and M7261 is used in all 11/10 versions, and
> of course all 11/05 versions. I could be wronge though ...
The 11/05 and 11/10 are, by now, the same machine ;-). What I mean
by that is that essentially the difference
>
>
> the microcode is "on the menu" for next weekend ...
> The system is a 11/10S, CPU is M7260 and M7261.
Are you sure that's an 'S'? I thought the 'S' was the M8260/M8261 board
set with the links to disable the bus arbiter so it can be used as a slave
processor.
Anyway, getting back to
>
> > The other is the 11/05S schematic, which shows the later boards with
> > the crystal UART clock
>
> Say what? The "11/05S schematic" from Bitsavers shows the RC clock; look on
> page 61, bottom left corner, there's an RC circuit (and a couple of flops)
> producing an output "DPH
> > Hello everyone,
> >
> > I'm working to troubleshoot a 286 laptop style computer. I've kind of hit
> > the end
> > of my knowledge and wondering if anyone has any insight.
Make/model? (Just in case anyone knows it and knows if it has any quirks).
> >
> > The computer in question I've
> >
> > I'm fairly certain this is a serial board - mostly because the PO told
> > me so, and when I received it, it had a 25-pin male connector on a
> > three-wire cable carelessly soldered to the pads behind one of the
> > cable headers on the top edge. But the cable was removed as a matter
> >
> I couldn't spot how they did level shifting to RS232 levels. The SI
> signal appears to go to a 7400 next to one of the Uarts.
There are a couple of 8 pin ICs near the 10 pin headers, they look to
be 1458 dual op-amps (I can't exactly make out the numbers...).
Op-amps were often used as
>
> Hey, everyone: those little glass capacitors (well, the casing is glass - I'm
> not sure what's inside) that one often sees used as per-chip noise/spike
> supression caps (often 0.01 uF or some such size) on 1970s/1980s vintage
> boards: are those things polarized, or can I put them in
>
> > I'm not sure what you're describing. Can you link to a pic of one of
> > these caps?
>
> http://www.electrical4u.com/images/glass-capacitor.jpg
Those are not polarised.
> > Why not some other type?
>
> Because on that board, they fitted _underneath_ the DIP sockets,
> and
>
> The plan is to get it to work with the 8kW core memory, M7800 connected to
> a good old teletype and PC05 paper-tape reader / punch and then run paper
> tape BASIC on it or other paper tape software.
> The problem is that I am lacking in the M7810 board. Since I do have a M105
> and M7821 a
[Second serial port on a PDP11/05]
> Curious: what if the built in one were
> faulty, or if you wanted to use rs-232
> instead of current loop?
IIRC the 11/05S has a way to disable the built-in
console port (fit a wire link on one of the boards?)
the original 11/05 doesn't. There must be a way
> > 2 of said feet got bent at right-angles (!)
>
> Hammer them straight, and clean up the threads with a die. Those outriggers
> are unobtainium, so I can't imagine the feet are much better.
They would never take being straightened, the metal is partially fractured
already.
I had assumed
>
> I have a BA11K power supply out of a pdp 11/34 that has frozen up fans.
> They are frozen up pretty bad. I heard from another list member here they
> are repairable, any advice on how to do so?
I have repaired many fans over the years, I am not sure if I have done those
ones specifically.
> >> and you may decide it is better to replace the fan.
> As far as I know, all the old DEC fans, from PDP-8 and
> PDP-11 models, are totally standard size, and can still be
> bought new from Digi-Key, Mouser, etc. If it is more than a
> few drops of oil needed, then it makes NO SENSE to repair
I am currently sorting things out after a house move last year and getting my
PDP11s back
together. Unfortuantely there was some damage in the move [1] and I am
currently looking for
a source for the following :
1) 2 off the small screw-down feet used on the outriggers of the H960 rack. Not
>
> > The RK06/07 cable connects all pins. The RL01/02 one connects only those
> > used
> > by the RL drives. I doubt the characteristic impedance is different as the
> > terminators
> > are the same.
> >
> > -tony
>
> Actually, the terminators for the RL and RK06/07 drives are *identical*,
>
> HOWEVER, while the PDP-11 is still unable to perform an
> LLF on an RX50 when an RQDX3 is present, it is possible
> to perform an LLF on a floppy in an RX33. Does that still
> seem compatible with your explanation?
Yes, that confused me too. The RQDX3 is clearly capable of
LLFing a floppy. So
>
> > Epson PX8?
>
> That's a commercial or industrial system? Did it run an EDM setup,
> turret lathe or vacuforming machine? Anyone keep their AR, AP, GL,
> payroll and inventory on one? I doubt that one could run a PBX.
I guess it depends on what you call a 'commercial' system. I
>
> Not CP/M admittedly, but small contemporary
> Burroughs machines certainly used cassettes, both
> for program and data storage. I wrote several
> fairly complex diskless accounting systems using
> four cassette drives, one or two card readers and
> a line printer (in addition to the console
>
> If it was possible to perform a LLF using the same RX50 drive on
> the Rainbow, what was the reason why an LLF could not also be
It is. Remember the RX50 is just a drive, it does not include any of
the controller electronics.
> performed on a PDP-11? There seems to be a number of
> Spot on. it HAS the 2114 ram chips. now to find replacements..
The slight delay after power-on before giving the error indication suggested
a memory test to me...
Of course it might not be 2114 problems, but I have replaced so many of those
ICs over the years in all sorts of devices that I
>
> and, of course, as a third type, Exatron Stringy-Floppy
> computer based, but NOT entirely usable.
Along with its inferior friend the Sinclair Microdrive
which was entirely NOT useable.
-tony
> Indeed, this whole list is about people saving computers that don't really
> have any _practical_ use any more. By definition, from a purely _functional_
> perspective, their value is scrap. But our viewpoint is not that - we see
> them as interesting and historic artifacts - and in that
> Hi All,
>
> we have a 1039 in our space with the user guide, but without any service
> docs. Our specimen does not react to buttons except the reset and test
> buttons. the four statusleds light up on a reset and after a second the
> center two leds start blinking in sequence. paper and pens
> It is possible to create an executable file that identifies the OS that it
> is running on and does a conditional jump to different code, assuming that
> the processor uses the same instruction set.
In some cases it should be possible to write a machine code program that
executes
on 2
>
> > XYZZY. hopefully banishing the creature back to the cave.
> >
> > Plugh (for good measure)
> >
> >
> Y2
A hollow voice says "Cretin"
-tony
> > Its a while back but I seem to remember in BASIC you replaced a set of line
> > numbers with another of the same range but different code.
>
> Blimey, I've never seen that.
A lot of disk-based BASICs had a statement that would merge a program from
disk in this way. Sometimes the program had
>
>
> Simple answer. The control store functionality had to fit in the available
> space
> on one hex
> sized card, and 16K density DRAM was the only option. Allocating additional
> space to use
> 4K or 1K SRAM would have pushed the CPU design to an additional board, which
> was not
> a design
>
> > Are there any computers that do let you put microcode into RAM
> > now-days.
>
> "Now-days"? There are some that do that, some of which are still in
> operational shape. Some VAXen, in particular, have something called
> "writable control store", which is essentially microcode RAM.
As
> >
> > As far as I know, the VAX11/730 (There is one next to me waiting for me to
> > have time
> > to restore it) has the microcode entirely in RAM. Classic PERQs (3 in the
> > next room) have
>
> The PDP-11 console loads the microcode from disk then mostly just sits there
> looking pretty
> Crispin Rope concentrates on the power of ENIAC and its usefulness, neither
> of which can be argued with, but to me a "computer" without self-modifying
> code is a programmable calculator even if it has index registers...
As a total thread-drift, I have in my hand a machine that anyone would
>
> Hello,
>
> in order to repair a HP-IL device I am looking for remains of HP-IB (yes)
> Thinkjet Printers.
On the grounds that the HPIB Thinkjet is an HPIL one with an HPIB-HPIL
interface (basically
an 82169 with different firmware)?
> I only need the PCB resp. the HP-IL chip on the PCB
>
> Yeah, as per my 'where are subsystem prints' page, they are in the 11/23
> print set MP00740, pg. 81-87 (schematic on pg. 87):
OK, got it... A one page schematic, a board witht 4 ICs. Shouldn't be too
hard...
(famous last words!)
OK, first thing, the things that look like op-amps are in
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